Microsoft still includes product activation in Windows 10 to prevent piracy. Windows 10 includes a new convenient chat option for product activation. If you upgrade from an activated Windows 7 or from Windows 8.1, Windows 10 will automatically activate. If you’re transferring a Windows 10 license to a new computer and have an Internet connection, you can use chat support to activate it.
Activate Windows 10 Using Chat Support
After installing Windows 10, press Windows key + R then type: slui then hit Enter on your keyboard.
This action will launch the activation wizard. Select your country or region and click Next.
Then at the Installation ID screen, you will be prompted to call the number listed on the screen. If you have an active Internet connection, you can use the new chat option.
Click the Start button and head to All Apps > Contact Support.
Update: In the Windows 10 Creators Update and later versions, contacting support is now available in a new app called Get Help.
Click Services & Apps then click Windows.
Click Setting up then click Chat online with a Microsoft Answer Tech.
Wait while you are connected to a Microsoft Answer Tech.
After you are greeted by the call agent, explain your issue. For this particular case, I want to reactivate Windows 10. You might be asked to provide your Windows 10 product key.
If you are reactivating a Windows 10 license, make sure to clarify to the agent you want a license reactivated. Provide the Installation ID generated earlier in the activation wizard. Once your Installation ID is verified, you will be given your Confirmation ID.
Proceed to enter the Confirmation ID then click Activate Windows. And you should be good to go!
You can let the agent know the issue is resolved, then close the chat window.
Chat support can also be used to address and resolve other issues you might be experiencing in Windows 10. I was skeptical about using this, but the experience was a pleasant surprise.